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Commit279f838a61("x86/amd: Detect preferred cores in amd_get_boost_ratio_numerator()") introduced the ability to detect the preferred core on AMD platforms by checking if there at least two distinct highest_perf values. However, it uses for_each_present_cpu() to iterate through all the CPUs in the platform, which is problematic when the kernel is booted with "nosmt=force" commandline option. Hence limit the search to only the online CPUs. Fixes:279f838a61("x86/amd: Detect preferred cores in amd_get_boost_ratio_numerator()") Reported-by: Christopher Harris <chris.harris79@gmail.com> Closes: https://lore.kernel.org/lkml/CAM+eXpdDT7KjLV0AxEwOLkSJ2QtrsvGvjA2cCHvt1d0k2_C4Cw@mail.gmail.com/ Reviewed-by: "Mario Limonciello (AMD) (kernel.org)" <superm1@kernel.org> Tested-by: Chrisopher Harris <chris.harris79@gmail.com> Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com> Link: https://patch.msgid.link/20251107074145.2340-2-gautham.shenoy@amd.com Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>